Land Rover cruise control testing
I had this Land Rover in the other day, and I can't find any diagnostic info for the cruise control at all. In fact, the codes I posted are ones that the customer told me it had. When I scanned it, it had several transmission ratio codes, which he is having another shop install his used transmission next week to resolve.
Data stream shows release button normally true. If I press any button, it changes to false. resume shows true when pressed. + shows true when pressed. - stays false all the time, but does change the state of the release button. If I was to guess, I would think that there's a button problem, but I have zero information on this system.
I found wiring diagrams for the cruise, and theory of operation, but zero tests. Does someone at least have the button resistance values, so that I can test it? I told him to see if replacing the transmission will fix it. If it doesn't he will be back.
Sean, out of curiosity what year and model Land Rover?
Sorry, I posted the vin, but it didn't take. SALAF25425A… LR3 HSE
When you were watching the + and - button input PIDs, were you driving or sitting in a bay?
Both sitting in a bay, and driving. I did find in mitchell, a description for the codes, and P0525 is an internal control module software corruption, maybe just cruise disable, and P0579 is a fault with the buttons, either high resistance, open, short, or stuck.
The course of action for the P0525: Refer to the warranty procedures and policy manual if a module is suspect.
The course of action for the P0579: Refer to the electrical guides, and check the cruise control circuit between the ecm and switch. Check the switch operation, and renew/renew as necessary.
It clearly states to test the switch operation, but no test is listed anywhere in Mitchell, or Identifix.
I'm not sure how he got those codes, because I did not pull them from any computer with my Solus edge, or Autel DS808.